<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>01_作用域</title>
</head>

<body>
    <script type="text/javascript">
        var value = 1
        function foo() {
            console.log(value);
        }

        function bar() {
            var value = 2
            foo()
        }
        bar();

    </script>
</body>

</html>